Jiaqu Fm
Type Locality and Naming
Himalayas. The type section is in roadcuts along the Jiacun-Yali and Lhasa-Zham Highways, Nyalam, Xizang (28°26'N, 85°54'E). The Jiaqu Fm was named by Lin Baoyu et al. (1982).
Synonym: (甲曲组）
Lithology and Thickness
It is represented by light purple argillaceous limestone and bioclastic limestone. In the type area, the Jiaqu Fm is 33 m thick.
Relationships and Distribution
Lower contact
Regionally, the next younger unit is the Hongshantou Fm of late-Late Ordovician.
Upper contact
Regionally, the next older unit is the Jiacun Fm of Early through Middle Ordovician.
GeoJSON
Fossils
This stratigraphic unit yields abundant cephalopods such as Sinoceras chinensis, Michelinoceras xuanxianense, M. paraelongatum; conodonts of Eoplacognathus jianyeensis assemblage, including E. suecicus subassemblage, E. foliaceous subassemblage, E. reclinatus subassemblage, E. robustus subassemblage and E. lindstroemi subassemblage, and Hamarodus europacus-Amorphognathus tvaerensis-Protopanderodus liripipus assemblage.
Age
Depositional setting
It is deposited in shallow-marine shelf environment.
Additional Information